(19)
(11) EP 0 828 167 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.12.1998 Bulletin 1998/49

(43) Date of publication A2:
11.03.1998 Bulletin 1998/11

(21) Application number: 97301227.1

(22) Date of filing: 25.02.1997
(51) International Patent Classification (IPC)6: G02B 1/04
(84) Designated Contracting States:
DE FR GB

(30) Priority: 05.09.1996 JP 235295/96

(71) Applicant: NOF CORPORATION
Tokyo (JP)

(72) Inventors:
  • Tanaka, Katsuyoshi
    Oita-shi, Oita-ken (JP)
  • Suyama, Shuji
    Chita-gun, Aichi-ken (JP)
  • Tashiro, Tetsuro
    Oita-shi, Oita-ken (JP)

(74) Representative: Hallybone, Huw George et al
CARPMAELS AND RANSFORD 43 Bloomsbury Square
London WC1A 2RA
London WC1A 2RA (GB)

   


(54) Resin composition for polymerization casting and optical material


(57) A resin composition for polymerization casting containing :

20 to 60 % by weight of a monomer (1) represented by the formula (1)

wherein R1 stands for a hydrogen atom or a methyl group, R2 stands for an alkylene group having 2 to 4 carbon atoms, m and n each is an integer of 2 to 5;

10 to 40 % by weight of a monomer (2) represented by the formula (2)

wherein R3 stands for a hydrogen atom or a methyl group, R4 and R5 are the same or different groups and each stands for an alkylene group having 2 to 4 carbon atoms, j and k each is 0 or 1; and

5 to 70 % by weight of a monomer (3), the monomer (3) being identical with neither monomers (1) nor (2), and containing at least one vinyl group in a molecule thereof.





Search report